Box construction



A ril 9, 1929.

w. MAIER 1,708,700

BOX CONSTRUCTION Filed Jan. 6, 1925 abbot v1.21:

Patented Apr. 9, 1929.

- UNITED STATES 1,708,106 PATENT OFFICE.

WILLIAM MAIER, OF ST. LOUIS, MISSOUBL' BOX CONSTRUCTION.

Application filed January This invention relates to improvements in the construction of boxes made from blanks of fibre or paper board cut and creased to provide flaps adapted to be folded to form the sides of the box. The improvements are especially to be desired in constructing boxes of corrugated paper board.

An object of this invention is to dispose and arrange the creases on the blanks in such manner that the creases may be formed therein more expeditiously than'heretofore.

Another object is to provide an improved form of crease or seam which possesses at the same time both strength and flexibility.

The objects above set forth and advantages incident to the invention will be best understood and appreciated from the following description of one embodiment of this invention, selected from divers potential embodiments for the purpose of illustration.

In the accompanying drawings forming part of this specification, in which like numbers of reference denotes like parts wherever they occur, f

Figure 1 isa plan view depicting a box blank having its creases arranged in the manner provided by this invention;

Figure 2 is a fragmentary perspective view.

illustrating the mode of folding the blank of Figure 1 to form a box; and g Figure3 is an end view showing the seam as it appears when completed.

Prior to this invention, the creases on which the flaps of the blank were folded to form a box, were arranged in staggered relation on adjacent flaps of a series in order to compensate for the thickness of the box material in overlappin flaps after the blank has been folded to orm the box. Such a staggered 4o arrangement of creases is diflicult, if not quite impossible, of being formed in an expeditious manner by the continuous feeding of the box material through a suitable creasing apparatus, as for instance, between a pan of continuously moving forming or creasing rolls. This invention, therefore, substitutes, in place of the series of smgle creases ar-' ranged in staggeredrelation, a continuous seam comprising a'palr of parallel adJacent 5o creases 10 and 11 extending across the mate-v rial, as shown in Figure'l. The seams 12, ar-

ranged transversely of the creases 10 and 11, and connecting-together the intermediate sec- ;tions 13, 14, 15, and 16 adapted to forma closed series of four sides of the box, may consist of single creases. ,The slits-17 form con- 1c, 1925. Serial m. 2,879.

tinuations of the creases 12, and separate adjacent' flaps 2, 3, 4, 5, 6, 7, 8, and 9 from one another.

The creases 10 and 11 are preferably formed by pressing the blank between a pair of forming rolls. I

If corrugated fiber board be used, the outer layer 41 thereof, receives the pair of .sharp inward bends 42, best shown in Figure 3; while the other outer layer 43 has formed thereon the flatter outward bends 44, and the intermediate shallow flat-bottomed groove 45. The corrugated layer 46, interposedbetween the outer layers 41 and43, is crushed or upset accordingly.

When the blank of Figure lhas been thus prepared andcreased in the manner described, itmay be folded into boxshape as shown in Figure 2, section 16 being bent at right angles to section 15 on crease 12, flap 5 being bent at right angles to section 16 on crease 11, with its slit-formed edge resting in the space between the creases 10 and 11 between flap 4 and section 15. Flap 4 is .then folded over on the crease 10 to overlap flap 5 on the outside. The space between creases 0 and 11 provides clearance to compensate for the thickness of the flaps when folded to overlap one another, as, for instance, flap 4 overlaps flap 5. The remaining sections are folded on the respective creases 12, and the remaining flaps folded on their respective creases 10 and 11 to complete the formation of the box, as will be understood by those skilled in the art.

Having thus fully described this invention, I hereby reserve the benefit of all changes in form, arrangement, order, or use of parts, as it is evident that many minor changes may be made therein without departing from the spirit of this invention or the scope of the following claims.

' I claim: x

1. A box body comprising an elongated blank, said blank having parallelslits lead ing in from the opposite side edges thereof,

the slits at one side being longitudinally,

alined with the slits at the opposite side to define flaps, the blank being rovided withtransversely disposed creases w ich aline with the alined slits, and being provided with a pair of longitudinally dis d arallel creases, the inner creases of t e longitudinal creases being continuous from end to end of said blank and lying betweenthe inner ends of the alined slits andthe outer c f the longitudinal creases being in sections with the ends thereof terminating at the side edges of the slits and whereby the inner ends of the slits lie between the. members of thepairs of longitudinal creases, thus permitting theend flaps to fold between said inner and outer creases and to be covered by the intermediate flaps folding thereon, the formationof the longitudinal creases being such that'the unfolded inner creases form reinforcing ridges that abut against the adjacent marginal portions of the end flaps when the latter arefolded between said outer and inner creases.

2. A box body comprising an elongated blank, said blank having parallel slits leading .in from the opposite side edges thereof, the

slits at one side being longitudinally alined with the slits at the opposite .side, the blank being provided with transversely disposed creases which aline with the alined slits, the blank being providedwith a pair of longitudinally disposed parallel creases, the inner creases of the longitudinal creases being continuous from end to end of the blank and lying-between the inner ends of the alinedslits and the outer creases of the longitudinal creases being in sections with the ends thereof terminating at the side edges of the slits and whereby the inner ends of the slits lie between the members of the pairs of longitudinal creases, the-width of the spaces between the members of'the pa1rs of longitudinal creases being equal to the thickness of the blank,-each of-the said member creases of the longitudinal creases forming-ridges that project from one face of the blank.

3. A box body comprising an elongated blank, said blank having parallel slits leading in from the opposite side edges thereof, the slits at one side being longitudinally alined with the slits .at the opposite side to define flaps, the blank being provided with transversely disposed creases which aline with the alined slits, and being provided with a pair of longitudinally disposed parallel creases, the inner creases of the longitudinal creases being continuous from end to end of said blank and lying between the inner ends of the alined slits and the outer creases of the longitudinal creases being in sections with the ends thereof terminating at the side edges of the slits and whereby the inner ends of the slits lie between the members of the pairs of longitudinal creases, the width of the spaces between the members of the pairs of longitudinal creases being equal to the thickness of signature. WILLIAM MAIER. 

